Beans on toast.
Always have multipack of your favourite brand in the cupboard, such abundance is rather comforting.
Pimp your beans by loading in a large knob of butter as they heat through, & be generous with the butter in the toast. Butter only, it is an affordable luxury.
Invest in a dried paprika sausage for the store cupboard. Slice/dice to add to heating beans, top a home made pizza or add depth to a stew.
Chicken thighs always. Far cheaper & far more flavour than breast means. Skin on thighs can be roasted or BBQd.
Buy a chicken to roast larger than you need. Strict portion control & stripping the carcass will get you a roast dinner & just about two more meals from shredded meat. Cook bones, skin & grisly stuff in slow cooker for minimum 3 hours for super strength broth.
Get a slow cooker. One off cost, pennies to run & makes a good substantial scoff out of cheap cuts of meat.
Buy an occasional pack of quality streaky bacon, grill a rasher & top piles of beans on toast for a treat. Eek out rest diced/sliced in casseroles.
Big treat dinner is full-on dirty bacon sandwich. Make sure to swipe each slice of bread through the remaining bacon fat. Filthy!
Poach eggs in heating baked beans - easy peasy huevos rancheros.
Stock powder is a good idea. Vegetable stock covers all meals.
Sainsbo does large jars of dried oregano, so useful for anything tomato based.
Bay leaves - cheaper in ethic aisles or shops. Bung a couple of bay leaves in any stew/casserole/sauce as it cooks to give a robust flavour to everyday ingredients.
Lentils - orange lentils bulk out savoury scoff & no need to pre-soak.
Chick peas - pre-cooked in tins etc, store cupboard essentials. If you take a few minutes to rinse well & rub lightly to remove the skins, any hummus or dips will be smoother.
Tinned potatoes well drained, can boost a veggie curry & if dried well roast up quite nicely.